... ,valve,wellhead astm a193 conformed stud bolts bolt with nuts spec: M12 ,M16 etc stud application:flange ... astm a193 conformed stud bolts ,studded bolt with nuts,screw stud Pls have some general specs of ... ,M30x205 and so on .Normstud :astm a193 , nuts:astm a194usage valve,flange,wellhead connetctiondelivery portshanghaipaymentTTDear friends :How ... day!Yancheng Qihang Pertroleum Machinery bolt with nuts